How to make this faster

[Helmut Jarausch]

On Fri, 05 Jul 2013 13:44:57 +0100, Fábio Santos wrote:
May I suggest you avoid range and use enumerate(the_array) instead? It
might be faster.

How does this work?

Given

Grid= [[0 for j in range(9)] for i in range(9)]

for (r,c,val) in ????(Grid) :

Helmut